Senticolis, S. triaspis

4 Pages·1991·1.6 MB·Dutch

by  Price, Robert M

RE- SQUAMATk SERPENTES: COLUBRIDAE SENTICOLS,S . TIUASPIS
Catalogue of American Amphibians and Reptiles.
Price, R.M. 1991. Senticolis, S. hiaspis.
Senticolis Dowling and Fries
SmticoIisDowlingandFries,1 987:202.Type-speciesS, enlicoIis~
Cope 1866, by monotypy.
Content. A single species, hiaspis, is recognjzed
Definition. Smticolisis a medium-sized, elongate, anteriorly
and posteriorly tapered, long-tailed colubrine snake ( s mD owling
et al., 1983). The head is narrow, but distinct fromthe slender neck.
Theeye issmalltomoderate insizeandwitharoundpupil. Thegenus
has a primary row of three elongatetemporals, only two ofwhichmay
touch the postoculars (Fig. 1). The tail is equal to 2P2696 of SVL in Figure 1. Head of a juvenile Smticolis t. hiaspis. The three elongate
adult females and 30-35so f SVL in adult males. Dorsal scales are primary temporals are characteristic of the species. Courtesy of
lightly keeled and have indistinct, paired apical pits. The dorsal scale Herndon G. Dowling and the New York Zoological Society.
miaodermatoglyphic pattern is echinate. Scale counts range from
27+35+19t o 33+39+23,w ith many combitions of counts between pointed, and subequal inlength(smaller posteriorly). The prefrontal
these exuemes. The midlateral rows are involved in all additions and bone has a pointed anterior projection almost as long as high.
reductions. Usually dorsal scale rows VII or WI are involved with The hemipenis (Fig. 2) is extremely distinctive. It is 17-19
counts of 29 or more, and rows V or VI in lower counts. Ventral scales subcaudals in length and subcylindrical in shape. The proximal one-
are slightly angulate laterally and range from 241-264 in males and f i io f the organ is smooth. At the distal point of the smooth region
256-282 in females, with females tending to have 15.4-20.5s cales is apair of long, slightly recurved parabasal hooks, one on either side
more in different populations. The doacal scute is divided. Paired of the sulcus spermticus. Three to four rows of similar, but smaller,
subcaudals range from 87-110 in females and 95-126 in males, with spines occur distal to the hooks and diippear ont he distal half of the
mean dimorphism varying 13.2-22.2s cutes in favor of males. organ, where they are replaced by 19-24 oblique rows of papillate
The color panem of the crown of the head, though often broken calyces, which deaease slightly insize toward the apex, but continue
or obscured in adults, is visible in the young. It is distinaive in having to the end of the organ. The calyces are lozenge-shaped and each of
an elongate frontoparietal band with a central opening (Fig. 1). the foursides bears 3-5s tiff papillae. The lips of the sulcus areneither
The 19-24 maxillary teeth (usually 21-22) are recurved and raised nor ornamented.
Map. Distribution of Senticolis hiarpir. Open cirdes mark known localities, solid symbols mark type-localities for the subspecies. The cross-
hatched area indicates a region of intergradation.
Diagoosls. Senticolis m yb e distinguished from all other Werner (1 896), Oliver (1937), Hartweg and 0liver (1%0), Taylor and
member of the Lampropeltiini( s- Dowling and Fries, 1987) by iu Knobloch (1940), Smith (1943), and Taylor (1951). Subspecific
unique hemipenial morphology. With the exception of Asii Elaphe relationships were discussed by Barbour and Cole (1906), Smhh
radiata, which differ markedly from Senticolic in morphology and (1941), and Stuart (1948). Descriptions of young were provided by
biochemistry, all related genera have clawte or bilobed hemipenes Taylor (1940), Smith (19411, and Woodbury and Woodbury (1944).
without distinaive papillate calyces or paired hooks. Additionally, The first occurrence of this species in the United States was docu-
Senficolish as a proportionately longer hemipenis than most Elaphe, mented by Stone (191 1). Wright and Wright (1957) gave information
and all Pituophis, Bogertophis, and A&ona, the latter genera gen- on identification and coloration, and induded some taxonomic
erally possessing organs of 1@16 subcaudals in length. Senticolis notes. Dowling (19%) compared dorsal scale redudom and os-
differs from superficially similar members of the Colubrini such as teological features of this species with those of Gonyaroma Shaw
Gonyasoma, Aqymgm, and most species of Cobberand Spalero- and Campbell (1974) discussed hei dentification and habitat of the
sophis in lacking vertebral or paravenebral scale row reductions. species in Arizona. Lawson and Dessauer (1981) provided data that
support the separation of hiaspis from Elaphe, b e d o n electro-
Descriptions and Illustrations. See species account. phoretic evaluation of proteins. Dowling and Price (1988) discussed
the differences from Bogertophismd the proposed taxonomic status
Mstribution. See species account. within the Lampropeltiini Wilson and Meyer (1985) desaibed the
species in Honduras, provided a range map, and differentiated the
Fossil Record None. subspecies. A brief description, including identification, natural
history, and care in captivity of S. hiaspis infennedius appeared in
Pertinent Literature. The most important papers con- Mehrtens (1987). The taxon appears in many checklists, keys, notes,
cerning this genus are Mertens and Dowling (1952), Dowling (1952, and summary accounts, includmgthoseof Cope(1887,1892), Gadow
1%0), and Dowling and Fries (1987). (1905), ~tqnegerandBarbour(1917),VanDenburgh(1922), Blanchad
(1929, Amual(1930), Andrews (1937), Smith (1 938,19431, Hameg
Etymology. The name Senticolis is from the Latin sentis, a and Oliver (1940), Smith and Taylor (1945), Perkins (1949), Taylor
thorn or bramble, and colis, a penis, in reference to the large spines (19491, Stuart (1950, 19631, Hall (19511, Menens (19524, Manin
on the hemipenis. The gender is masculine (Dowlig, pen. comm.). (1955, 1958), Alvarez del Toro arid Smith (1956), Duellman (1957),
Cagle (l%8), Behler and King (1979), Lee (1980), Parmerlee and
Senticolis triaspis (Cope)
Neotropical Ratsnake or Green Ratsnake
Coluberrriaspic Cope, 1866:128. Type-locality, 'Belize" (formerly
British Honduras), restricted to the city of that name by Smith
andTaylor(l950). Holotype, USNM 24903, a juvenile male, col-
lected by Dr. Parsons, date of collection unknown (not exam-
ined by the author).
Ehphe ttiarpis: Amaral, 1930:159.
Senricolis mma.pisD: owling and Fries, 1987:202.
Content. Three subspecies are recognized: h'aqis, i w -
medius, and mutabilk
Deflnttion and Magnosis. See the generic account.
Descriptiom. The original description was provided by
Cope(1866). ~chmidatn dhdrews (1936) gavedetails of scutulation,
as did Gaige (1936), who also described the hemipenis. Schmidt
(1941) gave the scutulation of the type specimen. Menens and
Dowling (1952) and Dowling (1952) provided general descriptions.
The most comprehensive desaiption, including meristic chans, il-
lustrations, andrange maps, is hat of Dowling (1%0), muchof which
is summarized in the reclassificationo f the nenus (Dowlinn and Fries.
1987). A recent description is induded in Wilson and ~ G e(1r98 5):
Illustrations. Aphotographofthe typespecimenof Senticolis
hiaspis iniemdius appeared in Menens and Dowling (1952). A
photograph of a live specimen was included in Dowling (1960), as
we1 as an illustration of an evened hemipenis, and dorsal and lateral
sketches of the head. Wright and Wright (1957) presented several
photographs of S. hiaspis intennediur Color photographs of
infennedius are in Shaw and Campbell (1974) and Behler and King
(1979). Smhh and Brodie (1982) and Stebbins (1985) provided
colored illustrations of in&wnedius. Mehrtens (1987)showed a head
close-up of intemdius. A photograph of the miuodermatoglyphic
pattern is in Price (1981). Detailed hernipenial illustrations appeared
in Dowling and Fries (1987).
Distribution. Senticolis hiaspis has a brad geographic dis-
tri-bution, nn~in~fromsoutheasteArnri zona andsouthernTamaulipos
southw&d th;oigh Mexico and much of Central America to costa
Rica. The elevational range is from near sea level to over 2200 m.
Fossil Record. None.
Pertinent Literature. Much of what has been written about
this species concerns taxonomy and distribution The primar~
sources of information are Menens and Dowling (1952), Dowling Figure 2 Right hemipenis of S8nricoli.s hiaqoir, UMMZ 118522,15+
(1952, 1%0), and Dowling and Fries (1987). Earlier references, subaudals in length. The specimens was not completelye vertedand
including description of scutulation, indude Boettger (1883), Cope would have extended at least two subcaudals further in life. Courtesy
(1885,1900), Bocoun(1888), Boulenger (1894,18%), ~ilnthe(rla %), of F. Waite Gibson.
Powell (1980), Ballinger and Lynch (1983), and ~tebbi(i1 985).
Etymology. The name hiaspis is derived from the Greek
aspis, meaning 'shield," and fmi.s, meaning 'three,' in apparent ref-
erence to the three elongate primary temporal head scutes.
Remarks. The natural history of this species remains poorly
known. The majority of specimens have been taken in montane
mesophytic forests along the slopes of the Mexicanhighlands and in
Central America. In western and southern Mexico, it may be found
in more xeric thorn forest. The elongate habitus, small eyes, and
angulate ventrals have led to the supposition hat the species is
arboreal, but few sightings are available to support this contention,
and many specimens have been collected on roads and trails. The
principal prey of S. hiaspisappears to be rodents, although it also eats
bids. It has recently been bred in captivity (K. Tepedelen, in litt.).
The three subspecies of S. hiaspiswere previously assigned by
various authors totally or in part to the three species Elaphe hiaspis,
E. cblomoma, and E. mutabilis. Smith (1941) suggested that, based
on similaritiesi n scutellation,t he name Cohtber mutabilis Cope was
based on an albino specimen of E. hiaspis, and placed it in the
synonymy of the latter. Stuart (1948) resurreaed mutabilisas a valid
subspecies,r anging fromthephen Forest inGuatemala southwardto
Costa Rica on the Caribbean side of Central America. The specimen Figure 3. Smlicdis biaspis inkmnedius from the Chhahua
designatedastheh olotypeof Piwphisinknnedius by Boettger(l883) Mountains of Arizona. Photograph by Sam Dunton of a living
was shown by Menens and Dowling (1952) to belong to the tuon
specimen collected by JamesA . Oliver.
previously known as Ehpbe chbmsoma Giinther (1894); thus the
latter well-known name, which often appears in the literature, was
placed in the synonymy of incennediuc. ined by author).
Nahix mutabilk: Cope, 1887:71 (part).
Scolopbis mutabilis: Bocourt, 1888:680.
Cohberpo~W~e:rn er, 1896247. Type-locality, 'Honduras.' 11-
Coluber tria.pis Cope, 1866128. See species account. lustrated on pl. 6, additional type data unknown.
Ekapbe hiaspis mutubilis: hart, 1948:68.
Nahix hiaspis: Cope, 1887:71.
Ehpbe hiaspis in&media.. Mertens, 1952b:93.
Scolophis mutabilis: Bocoun, 1888:680 (part).
Senticolic hiaspis mutabilk. Dowling and Fries, 1987:202.
Ekaphe hiaspis hiaspix Stuart 1948:69.
Wticolis hiaspis hiaspit. Dowling and Fries, 1987202,
DlqnoeLs. This subspecies is characterized by juveniles with
Diagnosis. This subspecies is charaaerized by a median fewer than 80 total blotches, and with a median frontoparietal band
frontoparietal band and a s d ,r ounded, pale spot at or near the with an elongate centnl opening. The band is usually broken at the
frontoparietal suture. The adults are uniform pale brown dordy.
middle of the interparietal suture. A blotched pattern is retained into
adulthood.
Remark. The hdotype was mistakenly given as USNM 6735
in the original desaiption.
Literature Cited
Pilyopbis intennediusBoeuger, 1883:148. Type-locality, 'Mexico,'
restriaedto Haciend ean Edlt Steanb ibieo&. M ichoadn, Mexico by Dowlinn Alvvez del Toro, M. md H.M. Smith. 19%. Notulae herpetologicae
(1960). Holotype, Museum (SMF) 34575, a juvg
chiapuhe I. Herpetologka 123-17.
nile rmle from the colledion of Dr. Pa~enSte~h.ed ra.t e of col- Amual,A . do. 1930 (1929). Estudos dbre ophidios neotropicos.
lection unknown (not examined by ahor).
XWI. Lista remissiva dos ophidios da regiiio neou6pia. Mem.
Cohtber mubilis: Cope, 1885:175 (part).
Inst. Butantan 4:i-vG 129-271.
Nahix mutabilit. Cope, 1887:71 (part). Andrews, E.W. 1937. Notes on snakes from theYucatan Peninsula.
Scobpbis mutabilis: Bocoun, 1888:680 (put).
Cohber cblomsoma Giinther, 1894:115. Type-localities, 'Mexico,
Atoyac in Vera Cruz, Amula in Gumero, San Runon" (ldisco),
restrictedto Amula (=Almolonga), Gumero by Dowling (1 960).
Leaoholotype, British Museum (Natural History) 1946.1.12.99,
a w e , collected by H.H. Smirh, date of colleaion unknown
(not examined by author). Dowling (1960) cites thir individual
as specimen 'b" in Boulenger (1894). It is one of the three in-
ferred Giinther cotypes.
Ehphe c b b m mS tone, 1911:231.
Ehphemutabilis:Taylor, 1%@459.F itu seofthis combination(non
C. mutabilis Cope, 1885).
Ehphe hiaspis intemedia.. Menens and Dowling, 1952:197.
Senticolis hiaspis intermedia: Dowling and Fries, 1987202.
Diagnosis. This subspecies is characterizedb y juveniles with
a median frontoparietal band with a centnl opening extending
forward to the posterior end of the frontal scute, and with 80 or more
tod blotches. The adults are unicolor green dordy.
3. Sentko& trfuspfsm utabUls (Cope)
Cohrber hiaspis: Cope, 1879:271 (non C. tria.ph Cope, 1866). I I
Cohtber mutabilisCope, 1885175 (part). Type-locality, 'Vera Paz,' Figure 4. Subspecific variation in the head pauern of Senticolis
Guatemala, restricted to Alta Veravaz hinNands of Guatemala hiaspis as seen in juvenile snakes: a. Senticolis t. triqis, b. S. t.
by hart (1948). Holotype, USNM 6745;an adult female, col- mutabilis, c. S. I. inkmnedius Comesy of Herndon G. Dowling and
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