Newmanella spinosus Chan & Cheang, 2016

Sukparangsi, Woranop, Pochai, Ashitapol, Wongkunanusorn, Chinnakit & Salinee Khachonpisitsak,, 2019, Discovery of Neonrosellavitiata (Darwin) and Newmanellaspinosus Chan & Cheang (Balanomorpha, Tetraclitidae) from the Andaman Sea, eastern Indian Ocean, ZooKeys 833, pp. 1-20 : 1

Redescription of Newmanella spinosus Chan & Cheang, 2016 Figs 5, 6, 7, 8

Newmanella radiata . Chan et al. 2009: 199, fig. 170; Shuto and Hayashi 2013: 159, fig. 3c (non New. radiata ( Bruguière 1789).

Newmanella sp. Tsang et al. 2015: 325, fig. 1A, 327 fig. 2.

Newmanella spinosus Chan & Cheang, 2016: 212-220, figs 9-15.

Type.

NMNS-006535-00001, deposited in NMNS (not examined).

Material examined.

17 specimens, southern Thailand, Andaman Sea in the eastern Indian Ocean, Phang-Nga Province, Na-Tai District, Na-Tai rocky shore, 20 Mar 2018, A Pochai leg. ZCBUU-CP-007-023.

Diagnosis.

Parietes and opercular plates green on external and internal surfaces. External shell plate with numerous radiating or longitudinal lines extending from apex to base. Scutal margin of tergum with serrated teeth and broad spur with cutting edges. Cirrus II with equal rami and slight curvature of both rami carrying triangular spines. Basis of cirri IV–VI without spines. Greater curvature of both anterior ramus and posterior ramus of Cirrus IV with triangular spines. Mandible with five teeth, the third teeth bidentate, the fourth teeth with serrations and small teeth along the edge, and the fifth teeth sits on the middle of lower margin surrounded by other small spines. Labrum with four teeth on each cutting margin. Penis without basi-dorsal point.

Description.

Peduncle absent. Body length 2-3 cm. Shell green with longitudinal folds or lines from orifice toward base or radiating lines; low conic; composed of four shell plates including one carina, two laterals and one rostrum. Base calcareous with parietal tubes; three rows of irregular shape and size of parietal tubes (Fig. 5 A–F). External shell plate with longitudinal fold or striation from apex to base; some exhibited decolouration or erosion of shell plate. Basal margin of each shell plate irregularly undulated (Fig. 5E). Internal shell plate smooth and white to pale green; interior part close to orifice green and with some white horizontal striations (Fig. 5F). Orifice pentagonal (Fig. 5G). External surface of opercular plates white with irregular green spots or lines (Fig. 5G). Internal surface of opercular plates mostly white with green, in particular scutum (Fig. 5H). Tergum smaller than scutum (Fig. 5I, J). Tergum triangular with clear spur protruding from basal margin; dorsal surface with horizontal lines; longitudinal furrow on dorsal side broad connected to spur. Spur of tergum broad with cutting edge tip. Scutal margin with serrated teeth. Basal margin of tergum with lateral depressor muscle crests thick (9-10 crests); tergal articular ridge with narrow width (Fig. 5I). Scutum triangular with height 1.3 times base. External surface of scutum with horizontal lines. Lateral depressor crest deep and numerous (5-8 crests) (Fig. 5J).

Cirrus I with unequal rami; anterior ramus (21-segmented) length approx. twice as long as posterior ramus (10-segmented) (Fig. 6A); intermediate segments of posterior ramus normal or not protuberant (Fig. 6B); greater and lesser curvature of both rami without spines (Fig. 6C, D); basipod without spines; serrulated setae found in both anterior and posterior rami (Fig. 6F, G); protopod on the posterior side with plumose setae (Fig. 6H). Cirrus II with equal rami and similar length (both rami with 10-segmented) (Fig. 6I); greater curvature of posterior ramus with serrulated setae (Fig. 6J, K); lesser curvature of posterior ramus with hook-like triangular spines (Fig. 6L) and lesser curvature of anterior ramus with slender spines and serrulated setae (Fig. 6M); apex of posterior ramus with long serrulated setae (Fig. 6N, O); apex of anterior ramus with bi-pinnate setae (Fig. 6P). Cirrus III with unequal rami; posterior ramus (26-segments) longer than anterior ramus (22-segmented, approximately 1.2 times; both rami antenniform (Fig. 6Q); basipod with spines (Fig. 6R) and anterior side of basipod with serrulated setae (Fig. 6S); weak curvature of both rami with hook-like triangular spines (Fig. 6T, U); greater curvature of anterior ramus with short spines (Fig. 6V); Both rami with serrulated setae and bidentate setae (Fig. 6 W–Y). Cirrus IV–VI with semi-equal and long rami (Fig. 7A, G, K); basis of cirrus IV–VI without spines, only denticles observed (Fig. 7E, J, N). Cirrus IV, anterior ramus 20-segmented posterior ramus 21-segmented (Fig. 7A); Greater curvature of posterior ramus with slender spines (Fig. 7B, C); Greater curvature of anterior ramus with broad triangular spines (Fig. 7B, D); each segment carries two pairs of long serrulated setae and one pair of shorter simple setae (Fig. 7F). No spine on each segment at lesser curvature side. Cirrus V, anterior ramus 19-segmented posterior ramus 20-segmented (Fig. 7G); Greater curvature of posterior ramus with slender spines (Fig. 7H) while no spines on anterior ramus (Fig. 7I). Cirrus VI, anterior ramus 24-segmented, posterior ramus 26-segmented (Fig. 7K); greater curvature of both rami with slender spines (Fig. 7L, M).

Maxilla bi-lobate; both lobes covered with serrulated setae (Fig. 8A, B, C). Maxillule with V-shaped notch; two large spines and five smaller spines before notch; six pairs of long slender spines and following seven smaller spines closed to inferior angle after notch (Fig. 8D); cutting edge after notch carrying a cluster of serrulated setae (Fig. 8E). Mandible with five teeth; the first teeth largest; the second and the third teeth bidentate; the fourth teeth serrated; the fifth teeth only single in the middle of lower margin surrounded by small and slender spines; lower margin narrow with a pack of 12 spines (irregular length); no setae under inferior angle (Fig. 8F). Labrum with V-shaped notch; four teeth with densely packed simple setae on each side of cutting margin (Fig. 8 H–J). Mandibular palp rectangular carrying densely packed serrulated setae on superior margin (Fig. 8 K–L). Penis long and annulated without basi-dorsal point (Fig. 8M inset); a few simple setae scattered randomly along whole length; at the tip of penis carrying two clusters of simple and long setae (Fig. 8 M–P).

Habitat.

The specimens were collected only during the lowest tide (March) of the year at the lowest tide littoral zone, the same habitat as Neonrosella vitiata .

Distribution.

Western Pacific from Taiwan (type locality) and Philippines ( Chan and Cheang 2016) and Andaman Sea of eastern Indian Ocean (Phang-Nga Province, southern Thailand).