Siphonaria emergens
Creators: name: Jenkins, Bruce
name: Köhler, Frank
Publisher: name: Zenodo
Year: 2024
Subjects: Biodiversity
Taxonomy
Animalia
Mollusca
Gastropoda
Siphonariida
Siphonariidae
Siphonaria
Siphonaria emergens

description: Siphonaria emergens (Jenkins, 2018)
(Figs 52E–F, T)
Pugillaria emergens Jenkins 2018: 279, fig. 5A–M (type locality: North Fingal Bay, Port Stephens, NSW [Australia]).
Material examined. Type material. Holotype of P. emergens from North Fingal Bay, Port Stephens, NSW, 32 ° 44.750’S, 152 ° 10.500’E, on beach in shell sand; coll. J. Voorwinde, 1950-60 (AM C.532859), two paratypes, same data as holotype (AM C.532860 2d).
Other, non-type material. Australia, NSW: Off Port Stephens, 32°42′S, 152°15′E (AM C.265971 2d); North Fingal Bay, Port Stephens, 32°44.750′S, 152°10.500′E (AM C.265919 20+d); Shelly Beach, Bateau Bay, S of The Entrance, 33°22′S, 151°29′E (AM C.265912 d); Blue Lagoon Beach, S of Tuggerah Lakes, 33°21′S, 15,1°30′E (AM C.265924 d); Long Reef near Collaroy, 33°44.498′S, 151°19.117′E (AM C.265920 d); Collaroy Beach, 33°43.700′S, 151°18.0′E (AM C.532861 d); Manly Beach, 33°47.817′S, 151°17.368′E (AM C.265913 d); Middle Harbour, 33°49.088′S, 151°15.427′E (AM C.265921 2d); off Chinamans Beach, 33°48.870′S, 151°14.965′E (AM C.265928 d); Bronte, 33°54.355′S, 151°16.252′E (AM C.265925 9d); Little Coogee Bay, 33°55.300′S, 151°15.600′E (AM C.265923 d, C.265914 2d, C.265915 d, C.265922 4d, C.265926 d); 2 km E of Mistral Point, 33°56.700′S, 151°16.700′E (AM C.265916 d); Cronulla, 34°2′S, 151°10′E (AM C.265931 4d, C.265929 d).
Shell (Figs 52E–F, T; Table S9). Small sized (max sl <5 mm); height medium; weakly elongate; apex well offset to posterior, aligning with or beyond shell edge (Jenkins 2018: figs 5A, G, J), to left of shell centre line; protoconch direction homostrophic (n = 1; Fig. 52T) below apex and shell height (Jenkins 2018: figs 5C, F, I, L); anterior and lateral apical sides convex, posterior concave almost notch-like; shell thin glassy translucent; dorsally arched with prominent curvature in shell-growth, growth striae irregular prominent; ribs radiate from apex to lip, indistinct, flat unraised; siphonal ribs not prominent on exterior, exterior coloration tan /red-brown with up to ten irregular white apical rib interstice bands extending and widening over lower half of sides to shell edge; lip fragile, undulated; spatula small, glossy, tan/red-brown, interior coloration reflects exterior coloration through translucent shell (Jenkins 2018: figs 5B, E, K), ADM scar horseshoe-shaped, weakly indented and shallow; cephalic ADM scar straight to weakly convex (Jenkins 2018: fig. 5E, H) between rounded left and right ADM scars, siphonal groove indistinct, very weakly indented.
Comparative remarks. Siphonaria emergens (atra group) has been found in sympatry with six congeners in Sydney Harbour, NSW: For comparisons with S. stowae, S. denticulata, S. diemenensis, S. funiculata, S. scabra, and S. zelandica refer to comparative remarks under these species. This species in known only from shells and its anatomy remains undocumented. Consequently, no DNA sequences have been available for genetic study.
Distribution and habitat. Incompletely known, yet to be live collected. Endemic to the, warm temperate central coast of NSW between Port Stephens and Cronulla Sydney, Australia (Fig. 51).
description: Published as part of Jenkins, Bruce & Köhler, Frank, 2024, Hidden in plain sight: Systematic review of Indo-West Pacific Siphonariidae uncovers extensive cryptic diversity based on comparative morphology and mitochondrial phylogenetics (Mollusca, Gastropoda), pp. 1-217 in Megataxa 13 (1) on page 140, DOI: 10.11646/megataxa.13.1.1, http://zenodo.org/record/14984186