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Ayarnangra Roberts, 2001 ZBK

Fig. 2

Ayarnangra Roberts, 2001 ZBK : 83. (Type species: Ayarnangra estuarius Roberts, 2001 ZBK , 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 ZBK 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 ZBK , Pseudolaguvia ZBK and Caelatoglanis ZBK by the absence of a thoracic adhesive apparatus, from Caelatoglanis ZBK by having a papillate (vs. plicate) upper lip, from Caelatoglanis ZBK and Erethistes by having a more slender body (Fig. 2), from Caelatoglanis ZBK and Pseudolaguvia ZBK by having moderate gill openings (vs. wide, nearly meeting one another on the venter), and from Conta ZBK 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 ZBK , UF 148530, 38.6 mm SL.

TABLE 2. External traits diagnostic for genera of Erethistidae

Conta ZBK Pseudolaguvia ZBK Caelatoglanis ZBK
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 ZBK Ayarnangra ZBK
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 ZBK 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).

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