Amerotyphlops illusorium GRABOSKI, ARREDONDO, GRAZZIOTIN, GUERRA-FUENTES, SILVA, PRUDENTE, PINTO, RODRIGUES, BONATTO & ZAHER, 2022
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Amerotyphlops illusorium
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| Higher Taxa | Typhlopidae (Typhlopinae), Typhlopoidea, Serpentes, Squamata (snakes) |
| Subspecies | |
| Common Names | |
| Synonym | Amerotyphlops illusorium GRABOSKI, ARREDONDO, GRAZZIOTIN, GUERRA-FUENTES, SILVA, PRUDENTE, PINTO, RODRIGUES, BONATTO & ZAHER 2022: 20 |
| Distribution | Brazil (Bahia: Fazenda Nova Alegria) Type locality: Fazenda Nova Alegria (16° 31′ 50.7′′ S, 39° 07′ 06.7′′ W, c. 30 m a.s.l.), municipality of Trancoso, state of Bahia, Brazil. |
| Reproduction | |
| Types | Holotype: MZUSP 18787, adult female (field number MTR 13542), collected by Miguel T. Rodrigues and collaborators on 26 March 2007 (Fig. 14; Supporting Information, Fig. S7). Paratypes: Two male specimens, MNRJ 19614 and MNRJ 19613, collected by Tiago S. Soares between 6 and 15 June 2010 from Praia de Porto Seguro, municipality of Trancoso, state of Bahia, Brazil (Supporting Information, Fig. S8A–D). |
| Diagnosis | Diagnosis: “This species is distinguished from all other South American congeneric species by the unique combination of the following of characters: (1) nasal suture incomplete; (2) rostral scale oval; (3) supralabial scales four; (4) infralabial scales three; (5) rows scales around the body 20/20/18; (6) mid-dorsal scales 221–230; (7) ventral scales 210–219; (8) rows of dorsal scales dark brown 13–15; (9) rows of ventral scales yellowish cream and immaculate five to seven; (10) caudal spine dark brown; (11) subcaudal scales ten to 12; (12) maximum TTL 229 mm; (13) maximum TL 6 mm; (14) nasal process of premaxilla contacting the vertical laminae of the nasals in the anterodorsal and posteroventral portions, with the central portion not in contact, leaving a large round canal between the olfactory chambers; (15) large palatine fossa on the lateral side of the maxilla; (16) maxilla with a straight medial border; (17) ventral pterygoid process of palatine straight; (18) ratio between length of ventral pterygoid process of palatine and skull length 0.06; (19) angle between mandibular condyle articulation and the retroarticular process of the compound bone close to 90°; and (20) dorsal surface of dentary bone with one to two evident foramina. Amerotyphlops illusorium differs from A. costaricensis, A. lehneri, A. microstomus, A. stadelmani, A. tasymicris, A. tenuis, A. trinitatus and A. tycherus by having an incomplete nasal suture (vs. complete nasal suture); from A. arenensis, A. caetanoi, A. amoipira, A. minuisquamus, A. paucisquamus and A. yonenagae by having 20/20/18 rows scales around the body (vs. 18/16/14, 18/18/14, 20/18/14 or 20/18/15 in A. minuisquamus and 18/18/18 in A. arenensis, A. caetanoi, A. amoipira, A. paucisquamus and A. yonenagae); from A. reticulatus by having highly pigmented cephalic scales with a dark brown dorsum and dorsum tail brown (vs. yellow and few pigmented cephalic scales, dorsum brown or black and dorsum tail black with cream or yellow spot); from A. montanum by having a smaller rostral width (RW1) at the dorsal portion, between 1.22 and 1.54 mm (vs. a larger rostral width at the dorsal portion 1.88 mm); from A. martis by having a largest number of mid-dorsal scales, between 221 and 230 (vs. fewer number of mid-dorsal scales, between 208 and 217); and from A. brongermianus by having the ventral portion of the pterygoid process of palatine straight (vs. ventral pterygoid process of palatine curved). Table 1 shows additional morphometric characters and scale patterns found in A. illusorium and morphologically similar species distributed in southern and north-eastern Brazil.” (Graboski et al. 2022) |
| Comment | Distribution: for a map see Graboski et al. 2022: 16 (Fig. 10). |
| Etymology | The specific epithet is derived from the Latin adjective illusorius, illusory or ironic, in reference to the external morphology that challenges its identification when compared to Amerotyphlops brongersmianus. |
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