Genera of the Asian Catfish Families Sisoridae and Erethistidae (Teleostei: Siluriformes). Author Alfred W. Thomson Author Lawrence M. Page text Zootaxa 2006 1345 1 96 http://www.zoobank.org/urn:lsid:zoobank.org:pub:25EFA792-7DA4-4E0D-A69A-12591B8422DE journal article z01345p001 25EFA792-7DA4-4E0D-A69A-12591B8422DE Ayarnangra Roberts, 2001 Fig. 2 Ayarnangra Roberts, 2001 : 83. (Type species: Ayarnangra estuarius Roberts, 2001 , by original designation). Gender masculine. Diagnosis: No thoracic adhesive apparatus; granulate anterior margin on pectoral spine; slender body shape; smooth to granulate anterior margin on dorsal spine; papillate upper lip; moderate gill openings; 13-16 anal rays. Ayarnangra is distinguished from all other erethistid genera by having 13-16 anal fin rays (vs. 8-12) and a granulate (vs. serrated) anterior margin on the pectoral spine. It is further distinguished from Conta , Pseudolaguvia and Caelatoglanis by the absence of a thoracic adhesive apparatus, from Caelatoglanis by having a papillate (vs. plicate) upper lip, from Caelatoglanis and Erethistes by having a more slender body (Fig. 2), from Caelatoglanis and Pseudolaguvia by having moderate gill openings (vs. wide, nearly meeting one another on the venter), and from Conta by having a granulate (vs. serrated) anterior margin on the dorsal spine and moderate gill openings (vs. extremely narrow gill openings not extending onto venter). FIGURE 2. Ayarnangra estuarius , UF 148530, 38.6 mm SL. TABLE 2. External traits diagnostic for genera of Erethistidae
Conta Pseudolaguvia Caelatoglanis
Adhesive apparatus on thorax Long; extends nearly to pelvic fin base Short; not reaching nearly to pelvic fin base; with median depression Short; not reaching nearly to pelvic fin base; without median depression
Gill openings Extremely narrow; restricted to pectoral fin base Wide; nearly meet one another on venter Wide; nearly meet one another on venter
Anterior margin of pectoral spine Serrations all directed toward tip of spine Serrations all directed toward tip of spine Serrations all directed toward tip of spine
Anterior margin of dorsal spine Serrated Smooth to granulate Smooth to granulate
Body shape Elongate (Fig. 4) Elongate (Fig. 8) Moderately elongate (Fig. 3)
Upper Lip Papillate Papillate Plicate
Anal fin rays 9-10 8-10 8-10
continued.
Erethistes Erethistoides Ayarnangra
Adhesive apparatus on thorax Absent Absent Absent
Gill openings Moderate; extend onto venter Moderate; extend onto venter Moderate; extend onto venter
Anterior margin of pectoral spine Serrations point toward tip, arranged in divergent pairs, or outwardly directed and not divergent (Fig. 6a & b) Serrations directed toward tip of spine distally and away proximally (Fig. 6c) Granulate
Anterior margin of dorsal spine Smooth to granulate Smooth to granulate Smooth to granulate
Body shape Robust (Fig. 5) Elongate (Fig. 7) Elongate (Fig. 2)
Upper Lip Papillate Papillate Papillate
Anal fin rays 8-12 9-11 13-16
Remarks: Roberts (2001) diagnosed Ayarnangra as a genus of Sisoridae . Description: Dorsal fin with 1 spine, 6 rays; pectoral fin with 1 spine, 5-6 rays; 6 pelvic-fin rays, 13-16 anal-fin rays, first 7-8 rays simple; 16 principal caudal rays. Body elongate. Eyes very small, nostrils huge, much larger than eye. Palatal teeth absent. Maxillary barbel with well-developed membrane, soft base; extending slightly beyond pectoral-fin spine origin. Bases of outer and inner mental barbels nearly parallel. Gill openings moderate; branchiostegal membranes broadly fused to isthmus. Pectoral girdle with large coracoid process externally visible. Pectoral-fin spine with finely granulated anterior edge, serrated posterior edge. Dorsal spine granulated anteriorly, with small serrations posteriorly. No thoracic adhesive apparatus. Paired fins non-plaited. Distribution: Irrawaddy River drainage, Myanmar (Roberts, 2001).