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Noqvttates PUBLISHED by the AMERICAN MUSEUM of NATURAL HISTORY CENTRAL PARK WEST at 79TH STREET NEW YORK, N.Y AMERICAN MUSEUM Noqvttates PUBLISHED BY THE AMERICAN MUSEUM OF NATURAL HISTORY CENTRAL PARK WEST AT 79TH STREET NEW YORK, N.Y. 10024 U.S.A. NUMBER 2568 FEBRUARY 25, 1975 VINCENT D. ROTH AND WYNNE L. BROWN A New Genus of Mexican Intertidal Zone Spider (Desidae) with Biological and Behavioral Notes AMERICAN MUSEUM Novitates PUBLISHED BY THE AMERICAN MUSEUM OF NATURAL HISTORY CENTRAL PARK WEST AT 79TH STREET, NEW YORK, N.Y. 10024 Number 2568, pp. 1-7, figs. 1-11 February 25, 1975 A New Genus of Mexican Intertidal Zone Spider (Desidae) with Biological and Behavioral Notes VINCENT D. ROTH1 AND WYNNE L. BROWN2 ABSTRACT Corteza interaesta, a new genus and species of Mexico, where it is found among barnacles on intertidal zone spider, is described from Sonora, the rocky shores of the Gulf of California. INTRODUCTION A female of an enigmatic spider, herein given by D. galapagoensis Hirst (Roth, In press) from the generic name Corteza, was collected by Dr. the Galapagos Islands. Joseph A. Beatty while on a field trip along the We are indebted to Dr. Joseph A. Beatty for Gulf of California in Mexico. Beatty keyed it out providing the initial specimens and collection to the family Agelenidae (Petrunkevitch, 1939) data, and to Dr. Bruce Firstman for information and sent it to the senior author for further identi- on the heart. Identifications and other help were fication. At first glance it appeared dictynoid but generously given by Drs. Arnold Ross, Fred C. lacked a cribellum and calamistrum, character- Harmston, and Willis J. Gertsch. istics admittedly not always deemed essential in Classification. The systematics of the Desidae family placement of spiders (Lehtinen, 1967; has been in flux since Roth (1967) redescribed Forster, 1970). With detailed locality data pro- the family for the single genus Desis and Lehti- vided by Beatty, it was possible to visit the same nen (1967) enlarged the concept to include 16 area (fig. 1) and to collect a small series of living genera placed in the Desinae, a subfamily of the males and females which were returned to the Amaurobiidae. Leech (1972) followed Lehtinen laboratory and used in mating and submergence in considering the Desinae a subfamily of the tests as well as for taxonomic purposes. Study of Amaurobiidae, but Forster (1970, p. 21) re- these specimens indicated that they probably turned the Desinae to family status in the super- represented an undescribed genus of the family family Dictynoidea, recognizing three sub- Desidae similar, both superficially and in habits, families: Desinae, Toxopinae, and Myroninae. He to the intertidal zone genus Desis Walckenaer, made extensive changes in the placement of which is represented in the Western Hemisphere genera and stated, "The majority of the genera of 'Resident Director, Southwestern Research Station, Portal, Arizona. 2University of Arizona, Tucson, Arizona. Copyright © The American Museum of Natural History 1975 ISSN 0003-0082 / Pricc 70 cents 2 AMERICAN MUSEUM NOVITATES NO. 2568 1 FIGS. 1, 2. 1. Type locality, Norse Beach, Puerto Pefiasco, Sonora, Mexico. 2. Refugium of Corteza interaesta, new species, the barnacle Tetraclita squamosa Brugiere. Lehtinen's Matachiinae do probably fall within Etymology. Named after the "Sea of Cortez" my Desinae .... The fifteen [actually 16] (Gulf of California) where the spider lives along genera placed by Lehtinen in his Desinae are rocky shores. however subject to considerable re-allocation and Description. Length of seven males and two only Desis is definitely retained." females, 4.6 to 5.8 mm. Carapace (figs. 3-5) with Forster's definition of the Desinae is quite low profile and longitudinal thoracic furrow. broad. It includes spiders with the following Eyes eight, in two straight rows, subequal in size; characteristics: tracheal system limited to the PME smallest. Ocular quadrangle wider than abdomen or extending into the thorax; cribellum long. Clypeus narrow, less than half diameter of and calamistrum present or absent; spination of ALE. Chelicerae stout (fig. 6), projecting forward tibiae I and II heavy or absent; trichobothria in in male, oriented 45 degrees off center line; pro- one or two rows; tarsal claws toothed or smooth; margin with three stout, widely separated teeth, scopulae present or absent; and habitat terrestrial retromargin with five to seven teeth. Labium or intertidal. Petrunkevitch's definition of the longer than wide; endites parallel-sided, angulate Agelenidae is more restrictive but sufficiently at tip; serrula present. Sternum truncate in front, broad to include Corteza. angulate behind. Lehtinen's (1967) concept of the Desinae Carapace/tibia-patella ratio, 108.0 (female) includes only three New World genera, Desis to 117.6 (male). Legs I and II lacking spines, III Walckenaer, Naevius Roth, and Porteria Simon. and IV with a few distal spines on tibiae and The last two genera from South America differ metatarsi. Female with smooth palpal claw. Pair from Corteza in having ventral spines on tibia I of stout curved setae opposite paired toothed and a small colulus. His Matachiinae are all claws. Tarsal scopula absent. Trichobothria pres- Australian, and most are cribellate or differ from ent in two rows of five to seven on tibia, one row Corteza at least in the dentition on the chelicerae of four to seven on metatarsi and tarsi, descend- (according to his tabular data). ing in length from tip. Trochanters not notched. For the purpose of the present paper Forster's Abdomen longer than wide, densely covered (1970) classification seems to be a more logical with short, finely pilose hair, 120-190 p long, arrangement of the desid genera. Corteza ap- separated by 55-70 p. Anterior spinnerets stout parently belongs in the Desinae of Forster near (fig. 7), slightly separated, two-segmented, distal the cribellate genus Notomatchia, the only other segment short, much wider than long. Posterior desid with a similar tracheal system. spinnerets two-segmented; distal segment conical, as long as basal segment, with spinning spigots with stout CORTEZA, NEW GENUS along ventral surface. Spigots short, base, and setae-like tips, about 20 on median, 30 Type spec ies. Corteza interaesta, new species. on anterior, and 50 on posterior spinnerets. 1975 ROTH AND BROWN: DESIDAE 3 Colulus as broad as area covered by spinnerets ing spines on legs I and II. Saltonia, tentatively and two-thirds as long, densely covered with fine placed in Agelenidae, has a similar distribution hairs. Tracheal spiracle at base of colulus, single but differs by having ventral spines on legs I and opening (appearing double externally) leading to II. Corteza also differs from Desis, which is large paired tracheal trunks extending into tho- found in similar habitats, in the following charac- rax. Heart apparently with two ostia. Mating teristics: endites with a serrula and quadrate position similar to that ofDesis martensi L. Koch rather than rectangular; absence of tarsal scopula (Bristowe 1931, p. 1404, fig. 2). and ventral tarsal spines; presence of single rather Distribution. Rocky shoreline near Puerto than double row of tarsal trichobothria; and Pefiasco to Punta Cuevas south of Puerto Liber- tracheal system extending into thorax. tad, Gulf of California, Sonora, Mexico. Diagnosis. Corteza keys to the Agelenidae in Corteza Petrunkevitch (1939) but differs in having interaesta, new species tracheal trunks extending into thorax; by lacking Etymology. From Latin inter, between, and overlapping fringe of hairs on fangs; and by lack- aestus, tides. 4 FIGS. 3-6. Corteza interaesta, new species. 3. Side view of male cephalo- thorax and chelicerae. 4. Dorsal view of eyes. 5. Dorsal view of male. 6. Ventral view of sternum and chelicerae. 4 AMERICAN MUSEUM NOVITATES NO. 2568 e" 4 '_ : ~ v; - Wa, .I 7 FIGS. 7, 8. Corteza interaesta, new species. 7. Spinnerets and colulus. 8. Right palpus, ventral view. Type data. Male holotype and female allotype five pale transverse chevron-like lines on poste- deposited in the American Museum of Natural rior part of abdomen. History from Pelican Point, Norse Beach on the Total length 5.2 mm. Carapace length 2.72 Gulf of California, Sonora, Mexico (latitude mm., width 2.04 mm., chelicera 2.10 mm. long, 310 20' N, longitude 1 130 38' W, on granitic rocks head width 1.46 mm., eye-row width 0.92 mm. in the intertidal zone among and in empty barna- Carapace low, head broad. Posterior eye row cle shells (Tetraclita squamosa Brugiere), March straight; anterior eye row procurved (5/6); rows 27, 1969 (V. Roth). Female paratype collected narrowly separated (fig. 4). Ocular quadrangle at same place July 28, 1962 (J. A. Beatty). Two wider than long, wider posteriorly. male paratypes and four immatures from 10 air- Chelicerae stout, projecting forward, setose, line miles south of Puerto Libertad, Punta Cirio, base of each seta tuberculate; three longitudinal Sonora, Mexico (latitude 290 23' N, longitude smooth patches extending from clypeus halfway 1120 39' W), on large granitic boulder among down face of chelicera. Boss present. Retro- barnacles, September 24-25, 1973 (V. Roth, W. margin with seven distinctly separate teeth, Brown); immature male, 18 miles S Puerto Liber- largest near base of fang, isolated by twice dis- tad, Tidepool Beach, March 20, 1974 (V. Roth, tance of other teeth. Endites longer than wide W. Brown). (33/16), angulate at tip, terminated by tuft of Description of m7ale holotype. Color in alco- hairs curving toward median line. Labium slightly hol: carapace, endites, labium, and chelicerae longer than wide (17/15), slightly notched at tip. orange-brown, legs and sternum lighter; abdomen Sternum slightly longer than broad (40/36), gray. Some specimens with faint series of up to truncated anteriorly, blunt, lacking projection 1975 ROTH AND BROWN: DESIDAE 5 posteriorly. Coxae IV widely separated by width Beatty (personal commun.), "I would estimate of hind coxae.
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