Studies On The Crustacea Of The Turks And Caicos Islands, British West Indies. Iv. Heteromysis (Heteromysis) Spottei, A New Species

7 Pages·2000·4.6 MB·English

by  W W Price

PROCEEDINGS OF THE BIOLOGICAL SOCIETY OF WASHINGTON
113(1):88-94. 2000.
Studies on the Crustacea of the Turks and Caicos Islands, British
West Indies. IV. Heteromysis (Heteromysis) spottei, a new species
(Peracarida: Mysidacea: Mysidae) from Pine Cay
W. Wayne Price and Richard W. Heard
(WWP) Department of Biology, University of Tampa, Tampa, Florida 33606, U.S.A.;
(RWH) University of Southern Mississippi, Institute of Marine Sciences,
Ocean Springs, Mississippi 39566-7000, U.S.A.
—
Abstract. During a survey of the marine Crustacea in the vicinity of Pine
Cay, Turks and Caicos Islands, an undescribed mysid, Heteromysis spottei, new
species, was collected at depths ranging from 1 to 18 m. The new species
belongs to the subgenus Heteromysis Bacescu and can be distinguished from
the five other members of that subgenus known from the western Atlantic by
the setation of the telson. In Heteromysis spottei the telson has spine-setae
along the entire length of the lateral margins, spinules along the entire margins
of the cleft, and a pair of spine-setae on each apical lobe, the outer being nearly
A
three times longer than the inner. key and diagnostic table to the species of
the subgenus Heteromysis from the Northwest Atlantic is presented.
Excluding the commensal palaemonid ment. The term "spine-seta" as used here
shrimps, which have been addressed in a refers to any seta with spine-like character-
&
separate series of publications (Heard istics; a spine is defined as a non-articulated
Spotte 1991, Heard et al. 1993, Spotte et al. extension of the cuticle.
& &
1994, Spotte Bubucis 1996, Heard
Spotte 1997), this is the fourth contribution Heteromysis (Heteromysis) spottei, new
in a series on the crustacean fauna of the species
Turks and Caicos Islands. The first three re- Figs. 1-2
&
ports dealt with marine isopods (Kensley
Heard 1991, Schotte & Heard 1991, Schotte Material examine—d (all material from
et al. 1991). Turks and Caicos). Holotype: adult 9
USNM
This report presents the description of a (Length [L] 3.1 mm), 282719,
new species of mysid belonging to the ge- fringing reef off Pine Cay, live bottom/
nus Heteromysis Smith, 1873. The new spe- sand, depth 18 m, J. A. McLelland (coll.),
cies, which is referred to the subgenus Het- suction device, 12 Nov 1989. Paratypes:
USNM
eromysis (Heteromysis) Smith 1873 sensu adult 6 (L3.5mm), 282720; adult
Bacescu, 1968, was collected in water 6*, damaged, GCR—L 1346, same collection
m
depths ranging from 1 to 18 in the vicin- data as holotype. 1 adult 8, 2 9 9, (all
ity of Pine Cay. damaged) Pine Cay, shallow inner reef,
The type material was deposited in the sand-coral rubble substratum with associ-
National Museum of Natural History ated sponges and cnidarians, depth 4 m, 1
mm
(USNM), Smithsonian Institution, and the mesh dredge net, R. Heard, J. Mc-
&
Gulf Coast Research Laboratory (GCRL). Lelland, P. B—ubucis, S. Spotte (colls.), 5
We follow the setal classification ofWatling Nov 1988. 1 c? (damaged), Pine Cay
(1989) in which a seta is defined as an ar- (Rock-a-Wash Cay), depth 1 m, Neogoniol-
&
ticulated cuticular outgrowth of the integu- ithon sponge washings, R. Heard (coll.),
VOLUME 113, NUMBER 89
1
30 Oct 1988.—26 6, 1 9 (all damaged), mose distomedial spine-setae; article 3 with
same data as—holotype. 1 plumose and 3 simple distomedial spine-
Diagnosis. Article 3 of antennular pe- setae, 3 plumose spine-setae along lateral
duncle without distomedial flagellated margin.
spine-seta; thoracic endopod 3 with 3 flag- Eyes (Fig. 1A): large, oval, directed lat-
ellated spine-setae on medial margin of erally, distal part of eye stalk wider than
merus, medial margin of carpo-propodus cornea, lacking ocular tooth; cornea large,
without flagellated spine-setae; pleopods oval.
uniramous, reduced to simple setose plates Mandibles (Fig. 1D-F): molar, incisor,
with no modified spine-setae in either sex; and lacina mobilis as illustrated. Palp 3-seg-
endopod of uropod armed with 1 small mented; article 1 small, inconspicuous; ar-
spine-seta near statocyst; lateral margins of ticle 2 expanded, medial margin with 5-10
telson armed along entire length with 10- simple spine-setae, lateral margin with 4-5
12 spine-setae per margin (including apical proximal plumose spine-setae and simple
1
spine-setae), posterior-most lateral spine- distolateral spine-seta; article 3 half as long
seta 1.6—1.7 times length of preceding as 2, medial margin with 1 plumose spine-
spine-seta, extending beyond posterior end seta, distal part armed with 1 simple and 9-
of telson; outer apical spine-seta nearly 3 10 barbed spine-setae, 1 simple spine-seta
times longer than inner; cleft completely on medial surface.
armed with 18-20 spinules. Labrum and paragnaths (Fig. ID, G): as
—
Description. General body form (Fig. illustrated.
1A): moderately robust; carapace with an- Maxillule (Fig. 1H): outer lobe with 11
terior margin produced into pointed trian- stout apical and 3 subapical spine-setae; in-
gular rostrum; posterior dorsal margin ner lobe with 3 long, distally curved, serrate
emarginate, partly exposing thoracic seg- spine-setae, 2 plumose and 2 simple spine-
ment 8; anterolateral lobes rounded. setae distally, and 1 plumose and 1 simple
Antennule peduncle (Fig. IB): article 1 spine-seta on distomedial margin.
slightly shorter than article 3, with 3 plu- Maxilla (Fig. II): as illustrated; exopod
mose and 2 simple spine-setae on distolat- with 13—15 plumose spine-setae on disto-
eral process, dorsomedial longitudinal ridge lateral margin.
with 4 strong simple distal spine-setae; ar- Thoracic endopods 1-8 (Fig. 2A-G):
ticle 2 compressed with 2 distomedial thoracic endopods 1 and 2 as illustrated.
spine-setae, 1 simple and 3 plumose spine- Thoracic endopod 3, merus approximately
setae near middle of distal margin; article 3 1.6 length of ischium and equal in length
with simple spine-seta on medial margin, 3 to carpo-propodus, medial margin with 3
simple distomedial spine-setae, 3 plumose flagellated and 3 simple spine-setae, lateral
spine-setae near distolateral margin, 1 sim- margin with 1 distal simple spine seta; me-
ple spine-seta on dorsolateral surface, lack- dial margin of carpo-propodus with 4—5
ing flagellated spine-seta, males with small simple spine-setae, 2 simple and 2 stout ser-
moderately setose lobe on ventral surface. rate spine-setae on distomedial margin; dac-
Antenna (Fig. 1C): scale slightly shorter tyl small, with long, slightly curved claw
than peduncle, 3.0-3.2 times as long as on distal end surrounded by several simple
maximum width, medial margin strongly spine-setae. Thoracic endopod 4, merus
convex, lateral margin straight, all margins about 1.5 length of ischium; carpo-propo-
setose, lacking distal article; antennal pe- dus about 3A length of merus, with 3 articles
duncle having 3 articles; article 1 incon- (distal 2 subequal, combined length slightly
spicuous; article 2 just over 1.5 times lon- longer than proximal article); dactyl mi-
ger than article 3, short plumose spine-seta nute, papillate, lacking terminal claw. Tho-
near distolateral border, 2 simple and 2 plu- racic endopod 5, ischium and merus sub-
90 PROCEEDINGS OF THE BIOLOGICAL SOCIETY OF WASHINGTON
B
Fig. 1. Heteromysis spottei, new species. A, adult 9, dorsal view; B, antennular peduncle; C, antennal
&
peduncle and scale; D, labrium right mandibular palp; E, F, right mandible, inner and upper aspects, respec-
tively; G, paragnaths; H, maxillule; I, maxilla. Scale 1, A = 0.5 mm; C = 0.2 mm; B, D-F, I = 0.1 mm; A =
0.05 mm; Scale 2, G = 0.1 mm.
equal in length; carpo-propodus with 4 ar- merus, merus slightly longer than carpo-
ticles, distal 3 subequal in length, each half propodus; carpo-propodus with 3 articles,
as long as proximal article, ultimate article proximal distinctly longer than each of dis-
with 6-7 simple spine-setae (2 sickle- tal articles; dactyl small, papillate with dis-
shaped with strong articulated bases); dac- tal serrate slender claw. Thoracic endopod
tyl small, papillate with long distal, slender 8 (1 damaged limb available for study),
claw. Thoracic endopod 6, carpo-propodus, long, attenuated, at least Vi longer than other
ischium and merus subequal in length; car- thoracic endopods; carpo-propodus with at
po-propodus with 5 articles, distal 4 sub- least 5 articles.
%
equal in length, each about as long as Thoracic exopods: exopod 1 with 8 arti-
proximal article; dactyl small, papillate with cles; exopods 2-8 with 9 articles.
distal serrate slender claw. Thoracic endo- Thoracic sternal processes: median spi-
pod limb 7, ischium slightly longer than niform processes on sterna 3-7 in males.
VOLUME NUMBER
113, 91
1
Fig. 2. Heteromysis spottei, new species. A-G endopods of thoracic limbs 1-7; H, telson; I, uropod. Scale
1, H = 0.1 mm; Scale 2, A = 0.1 mm, B-G = 0.2 mm; Scale 3, I = 0.2 mm.
Pleopods: without sexual dimorphism; maximum width, lateral margins slightly
reduced to uniramous plates with no mod- concave, armed along entire length with 10-
ified spine-setae, similar in form. 12 spine-setae per margin (apical spine-setae
Uropods (Fig. 21): exopod about 1.2 included), increasing in length posteriorly,
times longer than endopod, lateral margin most posterio-lateral spine-seta 1.6-1.7
straight, medial margin slightly convex, all times length of preceding spine-seta, extend-
margins setose; endopod linguiform with 1 ing beyond posterior lobes of telson; outer
spine-seta on medial margin in region of apical spine-seta 2.8-3.0 times longer than
statocyst, all margins setose. inner; cleft, depth 0.25 length of telson,
Telson (Fig. 2H): 0.8 times length of ex- completely armed with 18-20 small spines.
—
opod of uropod, 1.4-1.5 times as long as Etymology. This species is named for
» •i
92 PROCEEDINGS OF THE BIOLOGICAL SOCIETY OF WASHINGTON
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Stephen Spotte in recognition of his many .Heteromysis mureseanui Bacescu, 1986
. . .
contributio—ns to marine science. -Endopod of uropod with 1 medial spine-
Habitat. Heteromysis spotte was col- seta, near statocyst 5
i
lected from habitats having a variety of cal- 5. Posterior half of lateral margins of telson
armed with spine-setae; margins of telsonal
careous algae, sponges, anthozoans, and
cleft with spinules in apical half only
other sessile forms. It occurred in depths of
m m Heteromysis nouveli Brattegard, 1969
less than 1 on the Caicos Banks, 3-4 -Lateral margins of telson armed with
m
in the back reef area, and 18 on the outer spine-setae along entire length; margins of
fringing reef. Unfortunately, our collecting telsonal cleft with spinules along entire
techniques were too general to determine if length
the species was associated with a specific Heteromysis spottei, n.sp.
sessile host.
—
Distribution. This species is presently Heteromysis spottei appears most similar to
known only from waters immediately ad- H. nouveli, but differs in several aspects, espe-
jacent to Pine Cay, Turks and Caicos Is- cially in the setation of the telson and third tho-
lands, British West Indies. racic endopod (see Key, Table 1). Except for H.
— {Heteromysis) waitei W. Tattersall, 1927, a
Remarks. The dichotomous key and Ta-
South Australian species, the distinctive telson
ble 1 present some of the salient characters setation of H. spottei differs from all other de-
that distinguish these western Atlantic spe- scribed species of the subgenus Heteromysis.
cies of the subgenus Heteromysis. Several characters distinguish H. spottei from H.
waitei including the presence of a single, instead
Key to western Atlantic species of the of 3~4> spine-setae adjacent to the statocyst on
subgenus Heteromysis Smith, 1873 sensu the "ropodaWl endopod and the absence of ocular
teeth (see Tattersa11 1927
Bacescu, 1968 )-
(species lacking flagellated spine on
segment. n3 or* ant.ennul!ar pedjunclie anda Acknowledgfements
sexually dimorphic pleopods). Support for the collection of specimens
used in this study was sponsored by the
1. Endopod of uropod with 12 or more spines ^Oak,l,ei•ghu TL. tT-hi.orne tF-oundjat-ion „t.ih_rougih_ a
taoloanpgexmedi..al, margi.n f,rom region of„ statocysnzt, BgranTthotornS_etepm,heemnbeS_prosttea.nd_W,eermtp,hlaony.keeO_sakolf'e, i.tgh.he
-Endopod of uropod with no spines or one '
Meridian Club, and the Turks and Caicos
spine medially, near statocyst 4
2. Margins of telsonic cleft with spinules along government for support and encourage-
We
entire length; antennal scale 3 times or less ment. are grateful to Steve Spotte for
as long as maximum width 3 his help, interest, and overall coordination
-Margins of telsonic cleft with spinules of the field work for the faunal survey. Pa-
only in apical part; antennal scale at least 3.5 tricia Bubucis, Jerry McLelland, and Steve
times as long as maximum width Spotte assisted in the collection of speci-
He^omysis elegans Brattegard, 1974 mens and provided other helpful assistance.
3. dCw,ii.aa.trl,.hprom3_-aprprgaoii..rpnsodouf_sstoofuttshpiirnde-tsheotraaeciocn de,i.nsdtoopmoed- TrUTT™nhiev. efcrisris.ttJyauot*f.huoT_ramwpvaas F.sa-ucpu.pl*otrJy«te.Ddjevt*euhlroo^pumgehunta
Grant
Heteromysisformosa S. I. Smith, 1873 -
-Carpo-propodus of third thoracic endo-
pod with no stout spine-setae on medial Literature Cited
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Heteromysis mexicana Escobar-Briones &
Cubaines: trois especes nouvelles de Hetero-
ooto, 199U mysis—et Heteromysoides spongicola n.g.,
4. Endopod of uropod with no spine-setae me- n.sp. Revue Roumaine de Biologic Serie de
dially, near statocyst Zoologie 13:221-237.
—
94 PROCEEDINGS OF THE BIOLOGICAL SOCIETY OF WASHINGTON
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.
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&
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—
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—
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&
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