Armatoglyptesflexuosus, Chan & Kolbasov & Cheang, 2012

Chan, Benny K. K., Kolbasov, Gregory A. & Cheang, Chi-Chiu, 2012, Cryptic diversity of the acrothoracican barnacle Armatoglyptes taiwanus in the Indo-Pacific waters, with description of a new species from the Mozambique Channel collected from the MAINBAZA cruise, Zoosystema 34 (1), pp. 5-20 : 10-14

publication ID	https://doi.org/ 10.5252/z2012n1a1
persistent identifier	https://treatment.plazi.org/id/08758792-FFB9-FFC0-FF66-B393BE8F2994
treatment provided by	Felipe
scientific name	Armatoglyptesflexuosus
status	sp. nov.

Treatment

Armatoglyptesflexuosus n. sp.

( Figs 2-6 View FIG View FIG View FIG View FIG View FIG )

TYPE MATERIAL. — Mozambique Channel. MAIN- BAZA, stn DW3169, 26°11’00”S, 35°01’00”E, 450 m, ♀ holotype boring in the coral Pavona sp. (MNHN- Ci3215 ) GoogleMaps .

OTHER MATERIAL EXAMINED. — Mozambique Channel. MAINBAZA, stn DW3169, 26°11’00”S, 35°01’00”E, 450 m, 5 ♀♀ (MNHN-Ci3215) and 4 dwarf ♂♂ attached to their exteriors GoogleMaps .

DISTRIBUTION. — At present, only recorded from the Mozambique Channel, at 450 m deep.

ETYMOLOGY. — The Latin adjective flexuosus denotes the strongly bent (recurved) posterior processes of the opercular bars, adiagnostic characterof this new species.

DIAGNOSIS. — Armatoglyptes having opercularbars with bifid teeth, posterior processes L-shaped, strongly bent/ recurved at tip region.

DESCRIPTION

Female

Shape of burrow opening narrow oval or spindleshaped ( Fig. 4A, B View FIG ). Opercular bars c. 400 µm long, armed with series of bifid teeth, simple setae, and small, swollen cuticular knobs ( Figs 2A, B View FIG ; 3A, B, F, I, J View FIG ); posterior processes strongly anteriorly bent/ recurved and becoming L-shaped, with bifid teeth and simple setae along their length ( Figs 2A, B View FIG ; 3B, G View FIG ); comb collar with long, feather-like cuticular projections, fusedat theirbases ( Fig. 3E, F View FIG ). Orificial knob distinct, shallow and globular, surface with setae and rare simple or bifid teeth ( Figs 2C View FIG ; 3C View FIG ). Lateral surfaces of opercular areacovered with sparse simple setae and rows of massive multifid scales, lateral bars undeveloped ( Fig. 3H View FIG ).

Maxilla triangular ( Fig. 5A View FIG ), with setae onexterior and inferior margins. Maxillule with two long and sharp upper and one smaller lower cuspidate setae, notchwithshortsharp seta, lower ⅔ of cuttingedge with numerous short, sharp setae ( Figs 2E View FIG ; 5B View FIG ). Mandible with three large teeth and two smaller teeth close to the lower margin, tiny sharp denticle insertedin eachgapbetweenthem (from 2nd to 5th), inferior angle with two sharp denticles and sparse setae ( Figs 2D View FIG ; 5C View FIG ). Mandibular palp trapezoidal (ice-hockey stick shaped), with simple setae on oblique distal part along exterior margin ( Fig. 5D View FIG ). Mouth cirri consisting of long, curved coxa, quadrangular basis, and three-segmented rami, anteriorramus slightly shorter than posterior, rami and basis with plumose setae ( Fig. 2F View FIG ). Four pairs of terminal cirri. Anterior surfaces of their annuli armed with two pairs of long distal and short medial setae, posterior surfaces with pair of distal setae ( Fig. 5F View FIG ). Caudal appendages two-segmented, without pedestal, basal segment with simple distal seta, terminal segment with four plumose distal setae ( Figs 2G View FIG ; 5E View FIG ).

Dwarf male

Cyprids of dwarf male with elongated carapace ( Fig. 6A View FIG ), posterior end truncate ( Fig. 6B View FIG ), with a pair of typical antennules, attachment segment III shoe-shaped ( Fig. 6C View FIG ). Posterior lattice organs 3-4 and unpaired large central pore distinctlyobserved on carapace surface ( Fig. 6E, F View FIG ). After settlement, dwarf male metamorphoses within carapace, shed cypris cuticle with thoracopods coming to lie in posterior part ( Fig. 6D, E View FIG ). Newly developed young dwarf male globular, with short posterior end terminating in distinct apertural slit ( Fig. 6G, H View FIG ), bearing antennules of typical cypris morphology, and lacking long attachment stalk ( Fig. 6G, I View FIG ). Mature dwarf male pear-shaped, with elongated posterior end, apertural slit long ( Figs 2H View FIG ; 6J, K View FIG ), cuticle of posterior end wrinkled with circular striations, without mantle teeth ( Figs 2H View FIG ; 6K, L View FIG ). Terminal part oflong, whip-shaped penis observed in posterior part of mature male ( Fig. 2H View FIG ). Dwarf males retaining compound eyes and naupliar eye from cyprid ( Figs 2H View FIG ; 6G, J View FIG ).

REMARKS

Themouthparts and caudal appendages of A. flexuosus n. sp. are similar to those of A. taiwanus , but the new species has strongly curved, “L-shaped” posterior processes of the opercularbars, which are differentfromthe slightly, graduallycurvedposterior processes, normally having a sharp curved spine or spines beneath their tips, that are characteristic of A. taiwanus .

Armatoglyptesflexuosus n. sp. isalso closeto A. mitis in havingan armedorificial knobandsimilar mouthparts, butdiffersby the L-shapedposterior processes of the opercular bars; A. mitis has conical posterior processes without a bent tip. Armatoglyptes stirni (Turquier, 1978) , A. thomasi ( Kolbasov & Newman, 2005) and A. wilsoni ( Tomlinson, 1969) also have anteriorly bent posterior processes of the opercular bars like those in A. flexuosus n. sp., but these species lack an armed orificial knob ( Kolbasov 2009). Armatoglyptes flexuosus n. sp. was found at 450 m andis thus a deep-water acrothoracican. This record isthe deepest forthe genus Armatoglyptes ( Kolbasov 2009) ; A. taiwanus ranges from 0 to 220 m, A. mitis from 0 to 78 m, A.stirni from 90 to 390 m, A.thomasi from 0 to 3 m, and A. wilsoni from 4 to 18 m.