Megarachne is a genus of eurypterid, an extinct group of aquatic arthropods. Fossils of Megarachne have been discovered in deposits of Late Carboniferous age, from the Gzhelian stage, in the Bajo de Véliz Formation of San Luis, Argentina. The fossils of the single and type species M. servinei have been recovered from deposits that had once been a freshwater environment. The generic name, composed of the Ancient Greek μέγας (megas) meaning "great" and Ancient Greek ἀράχνη (arachne) meaning "spider", translates to "great spider", because the fossil was misidentified as a large prehistoric spider.
With a body length of 54cm (21inches), Megarachne was a medium-sized eurypterid. If the original identification as a spider had been correct, Megarachne would have been the largest known spider to have ever lived. Eurypterids such as Megarachne are often called "sea scorpions", but the strata in which Megarachne has been found indicates that it dwelled in freshwater and not in marine environments.
Megarachne was similar to other eurypterids within the Mycteropoidea, a rare group known primarily from South Africa and Scotland. The mycteropoids had evolved a specialized method of feeding referred to as sweep-feeding. This involved raking through the substrate of riverbeds in order to capture and eat smaller invertebrates. Despite only two specimens having been recovered, Megarachne represents the most complete eurypterid discovered in Carboniferous deposits in South America so far. Due to their fragmentary fossil record and similarities between the genera, some researchers have hypothesized that Megarachne and two other members of its family, Mycterops and Woodwardopterus, represent different developmental stages of a single genus.
Known fossils of Megarachne indicate a body length of 54cm (21inches). While large for an arthropod, Megarachne was dwarfed by other eurypterids, even relatively close relatives such as Hibbertopterus which could reach lengths exceeding 1.5m (04.9feet).[1] Though originally described as a giant spider, a multitude of features support the classification of Megarachne as a eurypterid. Among them, the raised lunules (the vaguely moon-shaped ornamentation, similar to scales) and the cuticular sculpture of the mucrones (a dividing ridge continuing uninterrupted throughout the carapace, the part of the exoskeleton which covers the head) are especially important since these features are characteristic of eurypterids.[2]
Megarachne possessed blade-like structures on its appendages (limbs) which would have allowed it to engage in a feeding method known as sweep-feeding, raking through the soft sediment of aquatic environments in swamps and rivers with its frontal appendage blades to capture and feed on small invertebrates. Megarachne also possessed a large and circular second opisthosomal tergite (the second dorsal segment of the abdomen), the function of which remains unknown.
Megarachne was very similar to other mycteroptid eurypterids in appearance, a group distinguished from other mycteropoids by the parabolic shape of their prosoma (the head plate), hastate telsons (the hindmost part of the body being shaped like a gladius, a Roman sword) with paired keel-shaped projections on the underside,[3] and heads with small compound eyes that were roughly trapezoidal in shape.[4]
Megarachne servinei was originally described in 1980 by the Argentine paleontologist Mario Hünicken. The generic name, composed of the Ancient Greek μέγας (megas) meaning "great" and Latin arachne meaning "spider", translates to "great spider". The holotype (now stored at the Museum of Paleontology at the National University of Córdoba) was recovered from the Pallero Member of the Bajo de Véliz Formation of Argentina, which has been dated to the Gzhelian age, to million years ago.[5] [6] The specimen preserves the carapace, the first two tergites, three partial appendages and what is possibly a coxa (the proximalmost limb segment).
Hünicken wrongly identified the specimen as a mygalomorph spider (the group that includes tarantulae) based on the shape of the carapace, the 15mm wide circular eye tubercle (round outgrowth) located in the center of the head between the two eyes and a circular structure behind the first body segment which he identified as the "moderately hairy" abdomen. Hünicken's identification relied heavily on X-ray microtomography of the holotype. Additional hidden structures – such as a sternum and labium, coxae and cheliceral fangs – were also extrapolated from the X-radiographs.
With an estimated length of 33.9cm (13.3inches) based on the assumption that the fossil was of a spider, and a legspan estimated to be, Megarachne servinei would have been the largest spider to have ever existed, exceeding the goliath birdeater (Theraphosa blondi) which has a maximum legspan of around 30cm (10inches). Because of its status as the "largest spider to have ever lived", Megarachne quickly became popular. Based on Hünicken's detailed description of the fossil specimen and various other illustrations and reconstructions made by him, reconstructions of Megarachne as a giant spider were set up in museums around the world.[7]
The identification of the specimen as a spider was doubted by some arachnologists, such as Shear and colleagues (1989), who stated that while Megarachne had been assigned to the Araneae, it "may represent an unnamed order or a ricinuleid".[8] Even Hünicken himself acknowledged discrepancies in the morphology of the fossil that could not be accommodated with an arachnid identity. These discrepancies included an unusual cuticular ornamentation, the carapace being divided into frontal and rear parts by a suture and spatulate (having a broad, rounded end) chelicerae (already noted by Hünicken as a strange feature as no known spider possesses spatulate chelicerae), all features unknown in other spiders. However, the holotype was by then deposited in a bank vault so other paleontologists only had access to plaster casts.
In 2005, a second, more complete specimen consisting of a part and counterpart (the matching halves of a compression fossil) was recovered, preserving parts of the front section of the body, as well as coxae possibly from the fourth pair of appendages, was recovered from the same locality and horizon. A research team led by the British paleontologist and arachnologist Paul A. Selden and also consisting of Hünicken and Argentine arachnologist José A. Corronca reexamined the holotype in light of the new discovery. They concluded that Megarachne servinei was a large eurypterid (a group also known as "sea scorpions"), not a spider. Although Hünicken had misidentified Megarachne, his identification as an arachnid was not entirely absurd as the two groups are closely related.[9] A morphological comparison with other eurypterids indicated that Megarachne most closely resembled another large Permo-Carboniferous eurypterid, the mycteroptid Woodwardopterus scabrosus which is known only from a single specimen. Selden and colleagues (2005) concluded that despite only being represented by two known specimens, Megarachne is the most complete eurypterid discovered in Carboniferous deposits in South America so far.[10]